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Telegraph Key

Telegraph Key

Description (Brief)

Telegraph keys are electrical on-off switches used to send messages in Morse code. The message travels as a series of electrical pulses through a wire. The operator moves this key’s lever from side to side to make signals. Called a simplex-duplex key, this key can send messages either on one-way circuits (simplex) or on circuits designed to send messages on lines designed to carry two messages at once (duplex.)